toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (address != null) 'address': address!,
if (contactType != null) 'contactType': contactType!,
if (email != null) 'email': email!,
if (firstName != null) 'firstName': firstName!,
if (id != null) 'id': id!,
if (lastName != null) 'lastName': lastName!,
if (phone != null) 'phone': phone!,
if (title != null) 'title': title!,
};